{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:4CKBORA3XYKVGCQDQUAE7R7A7T","short_pith_number":"pith:4CKBORA3","canonical_record":{"source":{"id":"1006.5407","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-06-28T17:02:44Z","cross_cats_sorted":[],"title_canon_sha256":"1b9988612b9999e938320953701ff925daefb38aa5be314931aac099ae381f01","abstract_canon_sha256":"2ba4e7bebae79ccfa5c44917f1b8cf8afdc6240bdc4298161da641ceb33f3672"},"schema_version":"1.0"},"canonical_sha256":"e09417441bbe15530a0385004fc7e0fcde1de178b62c7dcbc48dda89a752e65e","source":{"kind":"arxiv","id":"1006.5407","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1006.5407","created_at":"2026-05-18T04:10:09Z"},{"alias_kind":"arxiv_version","alias_value":"1006.5407v3","created_at":"2026-05-18T04:10:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1006.5407","created_at":"2026-05-18T04:10:09Z"},{"alias_kind":"pith_short_12","alias_value":"4CKBORA3XYKV","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_16","alias_value":"4CKBORA3XYKVGCQD","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_8","alias_value":"4CKBORA3","created_at":"2026-05-18T12:26:03Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:4CKBORA3XYKVGCQDQUAE7R7A7T","target":"record","payload":{"canonical_record":{"source":{"id":"1006.5407","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-06-28T17:02:44Z","cross_cats_sorted":[],"title_canon_sha256":"1b9988612b9999e938320953701ff925daefb38aa5be314931aac099ae381f01","abstract_canon_sha256":"2ba4e7bebae79ccfa5c44917f1b8cf8afdc6240bdc4298161da641ceb33f3672"},"schema_version":"1.0"},"canonical_sha256":"e09417441bbe15530a0385004fc7e0fcde1de178b62c7dcbc48dda89a752e65e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:10:09.132352Z","signature_b64":"wClw1lKxOaz9hBmWgZ8S26xM40LTo4r9Lh1MwPTw4OxeoHfi4hMBfvTbYm+FmNsMDfb4CoxJ6i4ZUrR1zkMwBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e09417441bbe15530a0385004fc7e0fcde1de178b62c7dcbc48dda89a752e65e","last_reissued_at":"2026-05-18T04:10:09.131597Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:10:09.131597Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1006.5407","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:10:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qGGl0FIHJNLp0NT56nENifla07UyqKQTRfb31U1u6tAJU5YX1+sXjeE1IDT54bk5oT3y0px2utaGhg+NFFDCAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T15:40:03.344040Z"},"content_sha256":"b3b77faa462f2412b3138e6e6424be5c4434273a45d3870788b70cd01c5e6b07","schema_version":"1.0","event_id":"sha256:b3b77faa462f2412b3138e6e6424be5c4434273a45d3870788b70cd01c5e6b07"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:4CKBORA3XYKVGCQDQUAE7R7A7T","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fundamental Quantum Limit to Waveform Estimation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Carlton M. Caves, Howard M. Wiseman, Mankei Tsang","submitted_at":"2010-06-28T17:02:44Z","abstract_excerpt":"We derive a quantum Cram\\'er-Rao bound (QCRB) on the error of estimating a time-changing signal. The QCRB provides a fundamental limit to the performance of general quantum sensors, such as gravitational-wave detectors, force sensors, and atomic magnetometers. We apply the QCRB to the problem of force estimation via continuous monitoring of the position of a harmonic oscillator, in which case the QCRB takes the form of a spectral uncertainty principle. The bound on the force-estimation error can be achieved by implementing quantum noise cancellation in the experimental setup and applying smoot"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1006.5407","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:10:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rQqUIj0HqIbDaK29SEEy7ZXr1YxpmYfBkHx/idlESQT9CLtabb6qQ+sWY9DZw5hSUQA65RX5PD189NyaKwOeBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T15:40:03.344813Z"},"content_sha256":"73e5bb12d9484cfac893188344a13317b812b7b3546eb8a6579b602ce6f2d4e1","schema_version":"1.0","event_id":"sha256:73e5bb12d9484cfac893188344a13317b812b7b3546eb8a6579b602ce6f2d4e1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4CKBORA3XYKVGCQDQUAE7R7A7T/bundle.json","state_url":"https://pith.science/pith/4CKBORA3XYKVGCQDQUAE7R7A7T/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4CKBORA3XYKVGCQDQUAE7R7A7T/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-08T15:40:03Z","links":{"resolver":"https://pith.science/pith/4CKBORA3XYKVGCQDQUAE7R7A7T","bundle":"https://pith.science/pith/4CKBORA3XYKVGCQDQUAE7R7A7T/bundle.json","state":"https://pith.science/pith/4CKBORA3XYKVGCQDQUAE7R7A7T/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4CKBORA3XYKVGCQDQUAE7R7A7T/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:4CKBORA3XYKVGCQDQUAE7R7A7T","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"2ba4e7bebae79ccfa5c44917f1b8cf8afdc6240bdc4298161da641ceb33f3672","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-06-28T17:02:44Z","title_canon_sha256":"1b9988612b9999e938320953701ff925daefb38aa5be314931aac099ae381f01"},"schema_version":"1.0","source":{"id":"1006.5407","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1006.5407","created_at":"2026-05-18T04:10:09Z"},{"alias_kind":"arxiv_version","alias_value":"1006.5407v3","created_at":"2026-05-18T04:10:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1006.5407","created_at":"2026-05-18T04:10:09Z"},{"alias_kind":"pith_short_12","alias_value":"4CKBORA3XYKV","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_16","alias_value":"4CKBORA3XYKVGCQD","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_8","alias_value":"4CKBORA3","created_at":"2026-05-18T12:26:03Z"}],"graph_snapshots":[{"event_id":"sha256:73e5bb12d9484cfac893188344a13317b812b7b3546eb8a6579b602ce6f2d4e1","target":"graph","created_at":"2026-05-18T04:10:09Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We derive a quantum Cram\\'er-Rao bound (QCRB) on the error of estimating a time-changing signal. The QCRB provides a fundamental limit to the performance of general quantum sensors, such as gravitational-wave detectors, force sensors, and atomic magnetometers. We apply the QCRB to the problem of force estimation via continuous monitoring of the position of a harmonic oscillator, in which case the QCRB takes the form of a spectral uncertainty principle. The bound on the force-estimation error can be achieved by implementing quantum noise cancellation in the experimental setup and applying smoot","authors_text":"Carlton M. Caves, Howard M. Wiseman, Mankei Tsang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-06-28T17:02:44Z","title":"Fundamental Quantum Limit to Waveform Estimation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1006.5407","kind":"arxiv","version":3},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:b3b77faa462f2412b3138e6e6424be5c4434273a45d3870788b70cd01c5e6b07","target":"record","created_at":"2026-05-18T04:10:09Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"2ba4e7bebae79ccfa5c44917f1b8cf8afdc6240bdc4298161da641ceb33f3672","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-06-28T17:02:44Z","title_canon_sha256":"1b9988612b9999e938320953701ff925daefb38aa5be314931aac099ae381f01"},"schema_version":"1.0","source":{"id":"1006.5407","kind":"arxiv","version":3}},"canonical_sha256":"e09417441bbe15530a0385004fc7e0fcde1de178b62c7dcbc48dda89a752e65e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e09417441bbe15530a0385004fc7e0fcde1de178b62c7dcbc48dda89a752e65e","first_computed_at":"2026-05-18T04:10:09.131597Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:10:09.131597Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wClw1lKxOaz9hBmWgZ8S26xM40LTo4r9Lh1MwPTw4OxeoHfi4hMBfvTbYm+FmNsMDfb4CoxJ6i4ZUrR1zkMwBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:10:09.132352Z","signed_message":"canonical_sha256_bytes"},"source_id":"1006.5407","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b3b77faa462f2412b3138e6e6424be5c4434273a45d3870788b70cd01c5e6b07","sha256:73e5bb12d9484cfac893188344a13317b812b7b3546eb8a6579b602ce6f2d4e1"],"state_sha256":"428f9a196a06b0cfbe33c166ac05f543c81464dfa579dabf69ef189bbe135bdf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KWFnnWHq8gUICYlYXvoESP/tN/roLWYzxJ6XJl2mzmAuGdWYDViz/8P0yEOlTyNXn4fsOLdiD2aE2e7BWyVvBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T15:40:03.348741Z","bundle_sha256":"ed62a0bcec3426801ecc312bd20be64954e6ac3a8b46530163607cc11af4ceec"}}